"If anyone suffers severe trauma to the head and loses consciousness, they should be required to leave the field," said the PFA's John Bramall.

FA guidelines on head injuries

Medical Regulations. 2.7

All clubs shall ensure that any player having left the field of play with a head injury shall not be allowed to resume playing or training without the clearance of a qualified medical practitioner. The same provision shall apply where a head injury is sustained in training.

The Football Association says a player can continue if assessed by a doctor.

Lloris briefly lost consciousness after colliding with striker Romelu Lukaku late on in the match at Goodison Park and was assessed on the pitch before continuing.

Spurs manager Andre Villas-Boas said he believed Lloris looked capable of continuing and the French international later underwent a CT scan, showing no signs of concussion.